Description

C.I. Acid Yellow 207 is a synthetic monoazo acid dye, identified by CAS No. 42208-99-1, valued for its bright, vivid yellow hue and strong affinity for protein-based and polyamide fibers. This dye is engineered to deliver excellent light and wash fastness properties, ensuring color durability in demanding applications. It is primarily required by manufacturers in the textile, leather, and paper industries for dyeing and printing processes where consistent color strength and performance are critical.

Application

• Dyeing of natural protein fibers such as wool and silk.
• Coloration of synthetic polyamide fibers, including nylon.
• Printing applications on textile substrates.
• Leather dyeing for footwear, apparel, and upholstery.
• Paper coloration for specialty packaging and decorative papers.
• Ink formulation for specific industrial marking applications.

Basic Information

Product Name	C.I. Acid Yellow 207
CAS No.	42208-99-1
Molecular Formula	C16H12N4Na2O7S2
Molecular Weight	478.40 g/mol
Synonyms	Acid Yellow 207; Acid Leather Yellow GRL; C.I. 14205; Acid Fast Yellow G; Nylosan Yellow E-GRL; Telon Yellow GRL; Acid Yellow GRL; 5-Amino-4-hydroxy-3-(phenyldiazenyl)naphthalene-2,7-disulfonic acid disodium salt
EINECS	Contact for details

Quality Control

Our C.I. Acid Yellow 207 is produced under a rigorous quality management system. Each batch is tested to ensure compliance with industry standards for color value, strength, and purity. Certificates of Analysis (COA) detailing specific parameters are available upon request to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). Keep away from incompatible materials. Due to its light-sensitive nature, prolonged exposure to direct light should be avoided to maintain product integrity.

Specification

Item	Specification
Appearance	Yellow to orange powder
Identification (IR)	Conforms
Color Strength	100 ± 3% (vs. Standard)
Moisture Content	≤ 5.0%
Water Insoluble Matter	≤ 1.0%
pH (1% Solution)	6.0 - 8.0
Shade	Conforms to standard
Fastness Properties (Typical)	Light: 5-6; Wash: 4-5

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.